According to calhoun :

"wkearney99" wrote in message
...
Is there such a thing ? can you use car anitfreeze in the system ?

Yes pretty common, around here, to use it. Used a lot in seasonal homes that
get shut down the middle of winter, but also for those that have a problem
with a seldom used zone freezing.
There is a special, non toxic, antifreeze you are supposed to use if you are
connected to a municipal water supply. I know some that use dexcool.

It's better to use a non-toxic antifreeze regardless of what you're
connected to. Municipal water or not, you don't want automotive antifreeze
in your house plumbing.

Non-toxic antifreeze doesn't cost very much. Lots of places carry it
(ie: swimming pool places where freezing temperatures are possible,
or RV service places). Cheaper than DexCool by a substantial margin
I think.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.